Could be the starwood 4th quarter bonus similar to Marriott fall Megabonus. The bonus is 1000 points per stay at full service hotels,500 points per stay at lower end hotels and 10,000 points after 25 nights stayed.

I'm guessing that the "FS" stands for Full Service hotels and the "SS" stands for "Select Service" (Don't have a clue what the "B" in the "SSB" is for), and my guesses may be totally meaningless. As long as I get the points, they can code them however they like.

You could always call the SPG phone number and find out the reason. If you do, let the rest of us know.

I got the 500 YWR (Y3W) BONUS today as well . I checked with SPG online apparently it came from Marriott, the chat person indicate it is a bonus that was offered to us through Marriott, but not sure for what . the Chat person indicated it may have something to do with a points transfer I'd done recently. I wondered if it was a bonus for signing up for Emirates Airlines mileage program but apparently not

SAW THE FOLLOWING ON FLYERTALK --- SEEMS TO EXPLAIN WHAT THE BONUS WAS FOR ---- MAKES SENSE FOR ME

"Did you both recently link your SPG and Emirates accounts? There was a targeted offer that first went out in September, I believe, that gave 500 Starpoints for doing so: "Offer is valid only for the Starwood Preferred Guest® (SPG) member to whom this mailing piece is addressed. Member has the opportunity to earn 500 bonus Starpoints upon registering for Your World Rewards with SPG and the Emirates Skywards programme. Valid Your World Rewards registration is required either through spg.com/yourworldrewards or emirates.com/yourworldrewards. Member must register for Your World Rewards between 12:00am (ET) on 18 September 2017 and 11:59pm (ET) on 30 October 2017 to be eligible for the registration bonus. Bonus of 500 Starpoints will post to the member's SPG account within 4–6 weeks after registration..." Best regards, William R. Sanders Social Media Specialist Starwood Hotels & Resorts LLC spgchampion@starwoodhotels.com Starwood Lurker is offline "

--- I did create Emirates account so i'm pretty sure this is what that bonus was for now